Cognomen Černak (Чернак 
, Černak 
) , across the world, is a rare surname. The cognomen Černak is characteristic of Belarus, where it is quite a rare surname, Croatia, where it is a rare surname, and Ukraine, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Belarus, Russia, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Чернак | Kazakhstan, Russia, Ukraine, Belarus |
| Černak | Croatia |
| feliks černak SI |
|